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Variable on Both Sides

Shalini was a...

Question

Shalini was asked to solve a problem on the board. While solving the problem she made a silly mistake. Find the correct answer.
Question: Find the value of the expression $x^{3} - 6 x + 7$ when x = -3
Step i: $(- 3)^{2} - 6 (- 3) + 7$
step ii: - 27 - 9 + 7
step iii: - 29
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Solution

$x^{3} - 6 x + 7$ = $(- 3)^{3} - 6 (- 3) + 7$ = -27 + 18 + 7 = -2

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Variable on Both Sides

Standard VIII Mathematics

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